SANYO VPC-R1EX, VPC-R1E, VPC-R1, VPC-R1G, VAR-G5U STROBO CIRCUIT DESCRIPTION

1-4. CP1 STROBO CIRCUIT DESCRIPTION

1. Charging Circuit

When UNREG power is supplied to the charge circuit and the
CHG signal becomes High (3.3 V), the charging circuit starts
operating and the main electorolytic capacitor is charged with
high-voltage direct current.
However, when the CHG signal is Low (0 V), the charging
circuit does not operate.

1-1. Power switch

When the CHG signal switches to Hi, Q5406 turns ON and
the charging circuit starts operating.

1-2. Power supply filter

L5401 and C5405 constitute the power supply filter. They
smooth out ripples in the current which accompany the switch­ing of the oscillation transformer.

1-3. Oscillation circuit

This circuit generates an AC voltage (pulse) in order to in­crease the UNREG power supply voltage when drops in cur­rent occur. This circuit generates a drive pulse with a frequency
of approximately 50-100 kHz. Because self-excited light omis­sion is used, the oscillation frequency changes according to
the drive conditions.

2. Light Emission Circuit

When RDY and TRIG signals are input from the ASIC, the
stroboscope emits light.

2-1. Emission control circuit

When the RDY signal is input to the emission control circuit,
Q5409 switches on and preparation is made to let current
flow to the light emitting element. Moreover, when a STOP
signal is input, the stroboscope stops emitting light.

2-2. Trigger circuit

When a TRIG signal is input to the trigger circuit, D5405
switches on, a high-voltage pulse of several kilovolts is gen­erated inside the trigger circuit, and this pulse is then applied
to the light emitting part.

2-3. Light emitting element

When the high-voltage pulse form the trigger circuit is ap­plied to the light emitting part, currnet flows to the light emit­ting element and light is emitted.

Beware of electric shocks.

1-4. Oscillation transformer

The low-voltage alternating current which is generated by the
oscillation control circuit is converted to a high-voltage alter­nating current by the oscillation transformer.

1-5. Rectifier circuit

The high-voltage alternating current which is generated at
the secondary side of T5401 is rectified to produce a high­voltage direct current and is accumulated at electrolytic ca­pacitor C5412 on the main circuit board.

1-6. Voltage monitoring circuit

This circuit is used to maintain the voltage accumulated at
C5412 at a constance level.
After the charging voltage is divided and converted to a lower
voltage by R5417 and R5419, it is output to the SY-A block as
the monitoring voltage VMONIT. When this VMONIT voltage
reaches a specified level at the SY-A block, the CHG signal is
switched to Low and charging is interrupted.

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1-5. SY-A CIRCUIT DESCRIPTION

1. Configuration and Functions

For the overall configuration of the SY-A block, refer to the block diagram. The SY-A block centers around a 8-bit microprocessor
(IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.

1. Operation key input, 2. Clock control, 3. Power ON/OFF, 4. Strobe charge control.

Pin

1~2

3

4

5

6

7

8

9

10~12

13

14

15~16

17~18

19

20~23

24

25~26

27

28

29

30 SDIR

31 BAT_OFF

32 +3.2_SW

33

34 P ON

35~36

37

38

39~40

41

42

43

44~45

46

47

48~52

53

54~74

75~78

79~80

Signal

NOT USED

AVSS

AVR

AVCC

VDD3

UNREG (S)

VDD3

STROBO_V

P54~P56

VSS

DC_IN

X1, X0

MOD1, 0

P. ST.

S10~S13

P04

P05~P06

PLL_EN

USB_CNT

REQACK

RESET B

NOT USED

VF_LED_G

EXT_IRQ1

SDATA

SCLK

SELF_LED_R

NOT USED

X0A, X1A

BUZZER

CHARGE

NOT USED

VCC

NOT USED

SO0~SO3

NOT USED

I/O

O

O

O

O

O

O

O

I/O

O

O

O

O

O

Outline

-

-

-

-

I

I

I

I

I

-

I

-

I

I

I

I

I

I

I

I

-

-

-

-

-

-

-

-

GND

Analog power

Analog power

Main (ASIC system) power detection

Battery power input (analog input)

Main (ASIC system) power detection

Strobo charge voltage input (analog input)

Connect to GND through register

GND

AC adaptor connection detection (analog input)

Main clock oscillation terminal (4 MHz)

Connect to GND

Reset input

Key matrix input

Connect to GND through register

Connect to GND through register

ASIC PLL permission signal

USB connection detection H : Connection

Serial communication control signal

Serial communication control signal

Battery OFF detection H : OFF

3.2 V power (switch)

Reset output to ASIC L : Reset

DC/DC converter (analog) ON/OFF signal H : ON

-

VF LED (green) ON/OFF signal L : Light

External interruption signal

Serial communication control signal

Serial communication control signal

Self LED (red) ON/OFF signal L : Light

-

Sub clock oscillation terminal (32.768 kHz)

Buzzer output terminal

Strobo charge ON/OFF signal L : ON

-

Digital power

-

Key matrix output

-

Table 4-1. 8-bit Microprocessor Port Specification

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